We are the largest regional theme park operator in the world and the largest operator of waterparks in North America based on the number of parks we operate. Of our 25 regional theme parks and waterparks, 22 are located in the United States, two are located in Mexico and one is located in Montreal, Canada. Our U.S. parks serve each of the top 10 designated market areas, as determined by a survey of television households within designated market areas published by A.C. Nielsen Media Research in September 2018. Our diversified portfolio of North American parks serves an aggregate population of approximately 130 million people and 230 million people within a radius of 50 miles and 100 miles, respectively, with some of the highest per capita gross domestic product in the U.S.
Our parks occupy approximately 5,900 acres of land, and we own approximately 800 acres of other potentially developable land. Our parks are located in geographically diverse markets across North America. Our parks generally offer a broad selection of state-of-the-art and traditional thrill rides, water attractions, themed areas, concerts and shows, restaurants, game venues and retail outlets, and thereby provide a complete family-oriented entertainment experience. In the aggregate, during 2018, our parks offered approximately 920 rides, including over 150 roller coasters, making us the leading provider of "thrill rides" in the industry.
In 1998, we acquired the former Six Flags Entertainment Corporation ("Former SFEC", a corporation that has been merged out of existence and that had always been a separate corporation from Holdings), which had operated regional theme parks and waterparks under the Six Flags name for nearly forty years and established an internationally recognized brand name. We own the "Six Flags" brand name in the U.S. and foreign countries throughout the world. To capitalize on this name recognition, 21 of our parks are branded as "Six Flags" or "Hurricane Harbor" parks and, in 2014, we also began the development, with third-party partners, of Six Flags-branded parks outside of North America.